Theromdynamics of carbon in nickel-based multicomponent solid solutions Metadata

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Title

  • Main Title Theromdynamics of carbon in nickel-based multicomponent solid solutions

Creator

  • Author: Bradley, D. J.
    Creator Type: Personal

Publisher

  • Name: Oak Ridge National Laboratory
    Place of Publication: Tennessee

Date

  • Creation: 1978-04-01

Language

  • English

Description

  • Content Description: The activity coefficient of carbon in nickel, nickel-titanium, nickel-titanium-chromium, nickel-titanium-molybdenum and nickel-titanium-molybdenum-chromium alloys has been measured at 900, 1100 and 1215/sup 0/C. The results indicate that carbon obeys Henry's Law over the range studied (0 to 2 at. percent). The literature for the nickel-carbon and iron-carbon systems are reviewed and corrected. For the activity of carbon in iron as a function of composition, a new relationship based on re-evaluation of the thermodynamics of the CO/CO/sub 2/ equilibrium is proposed. Calculations using this relationship reproduce the data to within 2.5 percent, but the accuracy of the calibrating standards used by many investigators to analyze for carbon is at best 5 percent. This explains the lack of agreement between the many precise sets of data. The values of the activity coefficient of carbon in the various solid solutions are used to calculate a set of parameters for the Kohler-Kaufman equation. The calculations indicate that binary interaction energies are not sufficient to describe the thermodynamics of carbon in some of the nickel-based solid solutions. The results of previous workers for carbon in nickel-iron alloys are completely described by inclusion of ternary terms in the Kohler-Kaufman equation. Most of the carbon solid solution at high temperatures in nickel and nickel-titantium alloys precipitates from solution on quenching in water. The precipitate is composed of very small particles (greater than 2.5 nm) of elemental carbon. The results of some preliminary thermomigration experiments are discussed and recommendations for further work are presented.
  • Physical Description: Pages: 250

Subject

  • Keyword: Elements
  • Keyword: Alloys
  • Keyword: Thermodynamic Activity
  • Keyword: Nickel
  • Keyword: Dispersions
  • Keyword: Carbon
  • Keyword: Carbon Additions
  • Keyword: Thermodynamic Properties
  • Keyword: Solid Solutions
  • Keyword: Molybdenum Alloys
  • STI Subject Categories: 360603 -- Materials-- Properties
  • Keyword: Nickel Alloys
  • Keyword: Kinetics
  • Keyword: Physical Properties
  • Keyword: Chromium Alloys
  • Keyword: Metals
  • Keyword: Reaction Kinetics
  • Keyword: Solutions
  • Keyword: Titanium Alloys
  • Keyword: Transition Elements 360104* -- Metals & Alloys-- Physical Properties
  • STI Subject Categories: 36 Materials Science
  • Keyword: Nonmetals
  • Keyword: Mixtures

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Report No.: ORNL/TM-6282
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/5004927
  • Office of Scientific & Technical Information Report Number: 5004927
  • Archival Resource Key: ark:/67531/metadc1053181

Note

  • Display Note: Dep. NTIS, PC A11/MF A01.